Accrued Expenses and Other Current Liabilities - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Accrued Expenses And Other Current Liabilities [Line Items]
Reduction in liability for non-income tax audits	$ 3,300
Payment to resolve a previously recorded non-income tax liability	1,223	$ 2,167
Consumer Financial Protection Bureau Litigation Matter [Member]
Schedule Of Accrued Expenses And Other Current Liabilities [Line Items]
Penalty paid	$ 63	$ 1,200